Replacement battery fits 8 Turtle Beach compatible models. Specifications: 900mAh, 3.7V, Li-Polymer. Compatible with: Stealth 400, Stealth 500, Ear Force, Ear Force Stealth 520, Stealth 520, Stealth 600 and 2 more compatible models. Replaces: Turtle FT603048P, Stealth FT603048P. Turtle Beach replacement battery designed for Headset devices. A direct drop-in replacement for the original battery.